Groovy example source code file (InvokeConstructorTest.java)

This example Groovy source code file (InvokeConstructorTest.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Groovy tags/keywords

bob, bob, dummybean, dummybean, groovytestcase, gstring, integer, invokerinvocationexception, invoking, object, object, string, throwable, throwable

The Groovy InvokeConstructorTest.java source code

/*
 * Copyright 2003-2011 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.codehaus.groovy.runtime;

import groovy.lang.GString;
import groovy.util.GroovyTestCase;

/**
 * Tests method invocation
 *
 * @author <a href="mailto:james@coredevelopers.net">James Strachan
 * @version $Revision: 21515 $
 */
public class InvokeConstructorTest extends GroovyTestCase {

    public void testInvokeConstructorNoParams() throws Throwable {
        assertConstructor(new DummyBean(), new Object[0]);
    }

    public void testInvokeConstructorOneParam() throws Throwable {
        assertConstructor(new DummyBean("Bob"), "Bob");
    }

    public void testInvokeConstructorOneParamWhichIsNull() throws Throwable {
        assertConstructor(new DummyBean("Bob", new Integer(1707)), new Object[]{"Bob", new Integer(1707)});
    }

    public void testConstructorWithGStringCoercion() throws Throwable {
        GString gstring = new GString(new Object[]{new Integer(123)}) {
            public String[] getStrings() {
                return new String[]{""};
            }
        };

        Object expected = new Long(gstring.toString());

        assertConstructor(expected, new Object[]{gstring});
    }

    protected void assertConstructor(Object expected, Object arguments) throws Throwable {
        Object value = invoke(expected.getClass(), arguments);

        assertEquals("Invoking overloaded method for arguments: " + InvokerHelper.toString(arguments), expected, value);
    }

    protected Object invoke(Class type, Object args) throws Throwable {
        try {
            return InvokerHelper.invokeConstructorOf(type, args);
        }
        catch (InvokerInvocationException e) {
            throw e.getCause();
        }
    }
}